Symptoms of transient ischemic attack in the internal carotid artery system include: 1. The manifestations of transient ischemic attack in the internal carotid artery system mainly include distorted mouth, incomplete eyelid closure, impaired sensation and movement of the lateral limb, numbness, retrograde sensation, unstable holding, difficulty in lifting the foot, and visual impairment; 2. The manifestations of transient ischemic attack in the vertebrobasilar artery system mainly include slurred speech, difficulty in swallowing, choking on water, dizziness, unstable walking, impaired eye movement, transient hearing loss, crossed paralysis, unilateral limb paralysis, hoarseness, and transient impaired consciousness.